Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 7

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The magnitude of magnetic field induction at the centre $O$ in the figure shown is (Given: $R_{1} = 10 cm, R_{2} = 20 cm$ and $i = 1 A)$

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Important Questions on Moving Charges and Magnetism

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 8

Two long wires one carrying current

1 A

and other carrying

2 A

in the same direction are placed parallel to each other produces a net magnetic field

B

at the mid-point. What will be the field at midpoint when current

1 A

is switched off ?

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 9

A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross-section. The ratio of the magnetic field at

\frac{a}{4}

inside and

\frac{a}{4}

outside from the surface of wire is

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 10

The magnitude of magnetic field required to accelerate protons (mass

= 1.67 \times 10^{- 27} kg)

in a cyclotron that is operated at an oscillator frequency

10 MHz

is approximately

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 11

A large solenoid of windings of

400

turns per meter carries a current

5 A .

The magnetic field at the centre of the solenoid is about

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 12

What is the magnetic force per unit length experienced by wire $C$ as shown in figure? (Assume that all wires are parallel and infinitely long).

Question Image

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 13

The full deflection current of moving coil Galvanometer is

1 mA .

If it is converted into an ammeter of

10 A

range then value of shunt is

[Resistance of Galvanometer = 1 KΩ]

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 15

A hollow sphere of mass

m,

radius

R

is rotating about its diameter with angular velocity

ω .

If charge

Q

is uniformly distributed over the surface, then magnetic moment of sphere is

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Gamma Question Bank for Medical Physics>Chapter 19 - Moving Charges and Magnetism>Assignment>Q 1

A charged particle enters a uniform magnetic field perpendicular to it. The magnetic field